Distributions of stem rust severities in the A) RL population tested in Morden, Canada in 2014, B) RL population tested in Morden, Canada in 2015, C) RL population tested in St. Paul, USA in 2013, D) RL population tested in Njoro, Kenya in 2013, E) CS population tested in Morden, Canada in 2014, F) KN population tested in Njoro, Kenya in 2013, and G) KN population tested in Njoro, Kenya in 2014.